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DTC B2353: Ignition power supply (low input)
DTC B2354: Ignition power supply (high input)
 
 
cautionBefore replacing the ECU, ensure that the input and output signal circuits are normal.
 
 
 
 
TROUBLE JUDGMENT
These DTCs are stored when the ignition power supply voltage decreases to the specified value or less (DTC B2353) or increases to the specified value or more (DTC B2354). However, when the status returns to normal, the DTCs B2353 and B2354 are automatically erased.
 
 
TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit or the ETACS-ECU may have a problem.
 
 
TROUBLESHOOTING HINTS
  • The power supply circuit may be defective.
  • The battery may be defective.
  • The generator may be defective.
  • The ETACS-ECU may be defective.
  • The ignition switch may be defective.
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, check data list.
Check the ignition power supply voltage.
(1)
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Check the ETACS data list.
  • Turn the ignition switch to the "ON" position.
 
Item No.Item nameNormal condition
Item 254IG voltageApproximately 12 volts (battery positive voltage)
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Does the scan tool MB991958 display the item "IG voltage" is normal condition?
Go to Step 4.
Go to Step 2.
 
STEP 2. Battery check
Refer to GROUP 54A - Battery Test .
Is the battery in good condition?
Go to Step 3.
Charge or replace the battery. Then go to Step 3.
 
STEP 3. Charging system check
Refer to GROUP 16 - Charging System .
Is the charging system in good condition?
Refer to GROUP 54A, Diagnosis - Inspection Procedure 2 "ETACS-ECU does not receive any signal from the ignition switch (IG1)" .
Repair or replace the charging system component(s).
 
STEP 4. Recheck for diagnostic trouble.
Check again if the DTC is stored in the ETACS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is stored.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC stored?
Replace the ETACS-ECU.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).